Biaxial model for the incidence angle dependence of the optical efficiency of photovoltaic systems with asymmetric reflectors

Nilsson, Johan; Brogren, Maria; Helgesson, Anna; Roos, Arne; Karlsson, Björn

doi:10.1016/j.solener.2005.09.008

Cited by 14 publications

(3 citation statements)

References 7 publications

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“…In this study an incidence angle modifier model proposed by Nilsson et al (18) was used. The biaxial model uses the projected transverse incidence angle to determine the influence of the reflector and the real angle of incidence to determine the influence of the glazing in…”

Section: Testing and Characterization Methodsmentioning

confidence: 99%

Performance Evaluation of a High Solar Fraction CPC-Collector System

Bernardo¹,

Davidsson²,

Karlsson³

2011

JEE

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One of the most important goals on solar collector development is to increase the system's annual performance without increasing overproduction. The studied collector is formed by a compound parabolic reflector which decreases the collector optical efficiency during the summer period. Hence, it is possible to increase the collector area and thus, the annual solar fraction, without increasing the overproduction. Collector measurements were fed into a validated TRNSYS collector model which estimates the solar fraction of the concentrating system and also that of a traditional flat plate collector, both for domestic hot water production. The system design approach aims to maximise the collector area until an annual overproduction limit is reached. This is defined by a new deterioration factor that takes into account the hours and the collector temperature during stagnation periods. Then, the highest solar fraction achieved by both systems was determined. The results show that, at 50° tilt in Lund, Sweden, the concentrating system achieves 71% solar fraction using 17 m 2 of collector area compared to 66% solar fraction and 7 m 2 of a flat plate collector system. Thus, it is possible to install 2.4 times more collector area and achieve a higher solar fraction using the load adapted collector. However, the summer optical efficiency reduction was proven to be too abrupt. If the reflector geometry is properly design, the load adapted collector can be a competitive solution in the market if produced in an economical way.

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Section: Testing and Characterization Methodsmentioning

confidence: 99%

Performance Evaluation of a High Solar Fraction CPC-Collector System

Bernardo¹,

Davidsson²,

Karlsson³

2011

JEE

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“…Precise further work will further identify the reasons for these differences. (Nilsson, Brogren et al 2006) and Maximum Power Point Tracker (MPPT) (Enrique, Andújar et al 2009), and how simplified methodologies such as SAP take this into account is also required.…”

Section: Further Workmentioning

confidence: 99%

A comparison of the UK Standard Assessment Procedure and detailed simulation of solar energy systems for dwellings

Murphy¹,

Kummert²,

Anderson

et al. 2011

Journal of Building Performance Simulation

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The drive to reduce worldwide Carbon Emissions directly associated with dwellings and to achieve a zero carbon home dictates that Renewable Energy Technologies will have an increasingly large role in the built environment. Created by the Building Research Establishment (BRE), the Standard Assessment Procedure (SAP) is the UK Government's approved methodology for assessing the energy ratings of dwellings. This paper presents an evaluation of the advantage given to SAP ratings by the domestic installation of typical Photovoltaic (PV) and Solar Domestic Hot Water (SDHW) systems in the UK. Comparable PV and SDHW systems will also be simulated with more detailed modelling packages. Results suggest that calculation variances can exist between the SAP methodology and detailed simulation methods, especially for higher performance systems that deviate from the default efficiency parameters

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“…Non-imaging compound parabolic concentrator (CPC) is one of the most studied LCPV system, suitable for building integration [9], due to its higher acceptance angle [10] [11]. CPC includes reflective or refractive mirror [6] or dielectric [12] type; symmetric [13] or asymmetric [9]; 2-dimesional [14] or 3dimensional [15] type optics. Most studied CPC geometry for building integration is 2D symmetric and asymmetric type which accept all the incident rays within the acceptance angle however it rejects all other incident radiation which is outside the acceptance angle [16,17].…”

Section: Introductionmentioning

confidence: 99%

Temperature regulation of concentrating photovoltaic window using argon gas and polymer dispersed liquid crystal films

et al. 2021

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Low concentrating photovoltaic (LCPV) system has been studied extensively, which showed excellent potential for the building integration application. However, such a system suffers from higher operating temperatures due to the concentrated light exposed into the solar cell. In this work, two different methods have been used to regulate the operating temperature of the solar cell without the interference of any other external mechanism. Two concepts were used to study the operating temperature of the solar cells are: i) use of Argon gas within the concentrator element, ii) incorporation of polymer-dispersed liquid crystal films (PDLC) on top of the module. In both cases, the power was improved by 37 mW to 47 mW when temperature was reduced by 10°C and 4°C for the Argon gasfilled module and PDLC integrated module, respectively. In addition, the temperature effect of the PDLC integrated module showed a unique nature of reduction of the short circuit current due to the orientation of the liquid crystal particle, which increased at a higher temperature. The current study, therefore, shows the greater potential of improving the operating efficiency and reduction of solar cell temperature, without the need for additional pumping power such as needed for photovoltaic thermal application.

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Biaxial model for the incidence angle dependence of the optical efficiency of photovoltaic systems with asymmetric reflectors

Cited by 14 publications

References 7 publications

Performance Evaluation of a High Solar Fraction CPC-Collector System

Performance Evaluation of a High Solar Fraction CPC-Collector System

A comparison of the UK Standard Assessment Procedure and detailed simulation of solar energy systems for dwellings

Temperature regulation of concentrating photovoltaic window using argon gas and polymer dispersed liquid crystal films

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